A sharp 3.6-cm-across crystal of lemon-yellow sulfur of the purest hue and most intense saturation is perched on a really unusal matrix of contrasting dark calcite. The sulfur crystal is fairly translucent and extremely sharp. The matrix is a multigenerational mix of small dogtooth calcites (naturally colored dark by petroleum inclusions), perched on calcite replacement of an earlier generation of large, hexagonal aragonite crystals. This cabinet specimen is a rare combination and style, from the collection of Howard Belsky. Joe Budd photos

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